Business Segment Information (Schedule Of Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Segment margin									$ 347,264	[1]	$ 280,360	[1]	$ 262,333	[1]
Revenues	847,282	964,114	1,015,049	1,019,719	961,035	1,090,293	1,068,694	1,014,808	3,846,164		4,134,830		3,367,361
Capital Expenditures									644,548	[2]	704,205	[2]	426,298	[2]
ExternalCustomerRevenues									3,846,164		4,134,830		3,367,361
IntersegmentRevenues									0	[3]	0	[3]	0	[3]
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin									61,231		64,349		58,039	[1]
Revenues									83,157		82,585		70,782
Capital Expenditures									46,611		130,787		59,345	[2]
ExternalCustomerRevenues									66,760		65,452		56,198
IntersegmentRevenues									16,397		17,133		14,584
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin									71,598		44,530		38,500	[1]
Revenues									3,296		3,923		5,508
Capital Expenditures									37,639		94,286		269,365	[2]
ExternalCustomerRevenues									3,296		3,923		5,508
IntersegmentRevenues									0		0		0
Refinery Services [Member]
Segment Reporting Information [Line Items]
Segment margin									84,851		75,361		72,883	[1]
Revenues									207,401		205,985		196,017
Capital Expenditures									2,385		3,258		2,692	[2]
ExternalCustomerRevenues									218,297		216,860		205,110
IntersegmentRevenues									(10,896)		(10,875)		(9,093)
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin									86,239		47,726		37,528	[1]
Revenues									229,282		152,542		118,204
Capital Expenditures									232,783		260,736		37,188	[2]
ExternalCustomerRevenues									214,039		131,049		99,016
IntersegmentRevenues									15,243		21,493		19,188
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Segment margin									43,345		48,394		55,383	[1]
Revenues									3,323,028		3,689,795		2,976,850
Capital Expenditures									325,130		215,138		57,708	[2]
ExternalCustomerRevenues									3,343,772		3,717,546		3,001,529
IntersegmentRevenues									(20,744)		(27,751)		(24,679)
SEKCO [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital Expenditures									36,100		94,300
Gulf Of Mexico Crude Oil Pipelines [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital Expenditures													$ 205,600

[1] A reconciliation of Segment Margin to income from continuing operations before income taxes for each year is presented below.

[2] Capital expenditures include maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of internal growth projects) as well as acquisitions of businesses and interests in equity investees. In addition to construction of internal growth projects, capital spending in our Offshore pipeline transportation segment included $36.1 million and $94.3 million during the years ended December 31, 2014 and December 31, 2013 representing capital contributions to our SEKCO equity investee to fund our share of the construction costs for its pipeline. During 2014, capital spending in our marine transportation segment included $157 million for our purchase of the M/T American Phoenix. During 2013, capital spending in our marine segment also included $230.9 million for the acquisition of our offshore marine transportation assets. During 2012, capital spending in our pipeline transportation segment also included $205.6 million for the acquisition of interests in several Gulf of Mexico pipelines

[3] Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.